R0106-HP MSR Router Series High Availability Command Reference(V7)

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Usage guidelines
The member ports in Layer 3 aggregation groups do not have IP addresses, and they do not support fast
detection mechanisms. You can use this command to detect link faults and locate the faulty member ports
of Layer 3 aggregate interfaces. You can also configure this command on common Layer 3 Ethernet
interfaces to implement fast collaboration between interface state and BFD session state, and help
routing protocols complete convergence.
Before you configure this command, you must enable BFD control packet mode on both ends of the BFD
session. The destination IP address of BFD control packets is 224.0.0.184, and it cannot be configured.
HP recommends that you configure the IP address of the interface as the source IP address. If the interface
has no IP address configured, configure a unicast address other than 0.0.0.0.
Examples
# Create a BFD session to detect the state of interface GigabitEthernet 2/0/1, and specify the source IP
address as 20.1.1.1.
<Sysname> system-view
[Sysname] interface gigabitethernet 2/0/1
[Sysname-GigabitEthernet2/0/1] bfd detect-interface source-ip 20.1.1.1
bfd detect-multiplier
Use bfd detect-multiplier to configure the single-hop detection time multiplier.
Use undo bfd detect-multiplier to restore the default.
Syntax
bfd detect-multiplier value
undo bfd detect-multiplier
Default
The single-hop detection time multiplier is 5.
Views
Interface view
Predefined user roles
network-admin
Parameters
value: Specifies a single-hop detection time multiplier in the range of 3 to 50.
Usage guidelines
The detection time multiplier determines the maximum number of concurrent BFD packets (including
control packets and echo packets) that can be discarded.
Table 16 Detection interval calculation method
Mode Detection interval
Echo packet mode
Detection time multiplier of the sender × actual
packet sending interval of the sender
Control packet mode BFD session in
asynchronous mode
Detection time multiplier of the receiver × actual
packet sending interval of the receiver